First you need to download the game. You will find it in the "resources" tab. In order to play it, you will need a DosBox. I highly recommend using D-Fend Reloaded (also in resources), as it is the only way, water textures are loading properly and music is playing (for me at least).

Once you have downloaded and installed D-Fend, open it and simply drag and drop the zip file of the game into the D-Fend window. It will create an entry for the game and you can start it. For even easier access you can create a shortcut from within D-Fend to directly start the game. Just right click on the game and select "create shortcut".